/Engine/Source/Runtime/SignalProcessing/Public/DSP/LateReflectionsFast.h
InMaxNumInternalBufferSamples sets the maximum possible number of samples in an internal buffer. This only affectsinternal chunking and does not affect the number of samples that can be sent to ProcessAudio(...),
FLateReflectionsFast ( float InSampleRate, int InMaxNumInternalBufferSamples, const [FLateReflectionsFastSettings](API\Runtime\SignalProcessing\DSP\FLateReflectionsFastSettings) & InSettings )